Revision history for Perl extension Tree::R.

0.01  Mon Apr 11 09:43:42 2005
	- original version; created by h2xs 1.23 with options
		-X Tree::R
0.02  Apr 11 2005
	- fixed a small bug in PickNext
0.03  Apr 21 2005
	- fixed a small bug in remove
0.04  Jul 4 2005
	- changed to non-recursive queries from liuyi at cis.uab.edu
0.05  Jul 6 2005
	- a fix for a bug of infinite loops in insert from devbrat at gmail.com
0.06  Aug 10 2009
      	- remove root if tree is empty after remove; check for empty trees in objects and dump
0.07  Sep 14 2015
        - Some modernizations.
        - Remove deprecated recursive methods.
        - Methods with empty trees should not cause warnings.